Leno’s Law is the nickname California collectors use for the state’s smog-check exemption covering gasoline vehicles from the 1975 model year and earlier. The name honors Jay Leno’s long advocacy for protecting the state’s vintage car culture. In practice, if your car is a 1975 or older gas-powered vehicle, you never need a smog certificate to register it, renew it, or sell it in California.
Which Cars Qualify
California Health and Safety Code Section 44011 requires most internal-combustion vehicles to pass a biennial smog inspection, but it exempts every motor vehicle manufactured before the 1976 model year.1California Legislative Information. California Code HSC 44011 – Motor Vehicle Inspection Program The Bureau of Automotive Repair applies this cutoff to gasoline, hybrid, and alternative-fuel vehicles from the 1975 model year and earlier.2Bureau of Automotive Repair. Smog Check: When You Need One and What’s Required A 1976 car does not qualify, even by a few months. Model year is the line, and it is strict.
Diesel vehicles are not covered by the 1975 rule. They follow their own cutoff years, so diesel owners should check directly with BAR rather than assume the gas threshold applies.
The year was not always fixed. California originally used a rolling 30-year exemption that moved forward each year. In 2004, the legislature passed AB 2683, which froze the exemption at the pre-1976 model year.3California State Assembly. AB 210 (Voepel) Policy Committee Analysis The 1975 line roughly matches the first model year that catalytic converters became standard on American cars, making it a natural division between pre- and post-emissions-control vehicles.
Buying or Selling an Exempt Car
Some states exempt old cars from annual testing but still demand a smog check when ownership changes. California does not. Vehicle Code Section 4000.1 generally requires a valid smog certificate at initial registration and at transfer of ownership, but subdivision (d)(6) exempts any motor vehicle manufactured before the 1976 model year.4California Legislative Information. California Vehicle Code 4000.1
For a buyer, that means the seller of a 1975 or older car does not have to produce a smog certificate at closing. The DMV will not hold up the title transfer because one is missing. For a seller, it removes a logistical hurdle at swap meets, auctions, and out-of-state transactions where arranging a smog test before delivery would be impractical.
Kit Cars and Replicas Are a Separate Track
Kit cars, replicas, and other vehicles never assigned a model year by a licensed manufacturer do not slot neatly into the 1975 cutoff. California calls these “specially constructed vehicles,” and Senate Bill 100 created a separate path for them. Each must be inspected by a Bureau of Automotive Repair referee before registration.5California Air Resources Board. Enforcement Advisory: Specially Constructed and Senate Bill 100 Motor Vehicles in California
If the car passes, the referee issues a certificate treating it as exempt from smog requirements as though it were a 1965 or older model.6Ask the Referee – Smog Check Referee Program. Unusual Vehicles/Engine Changes The vehicle must be built for personal use, not resale, and must not have been assembled by a licensed manufacturer or remanufacturer. California only registers a limited number of these each calendar year, so book the referee appointment early. Once the referee affixes the chassis label, the exempt status stays with the car permanently.
One trap: a replica registered through SB 100 does not qualify for Year of Manufacture license plates, no matter how faithful the build is to an eligible era.
Registering a Pre-1976 Car With the DMV
You need the full Vehicle Identification Number, engine displacement, cylinder count, and proof of ownership — a title from the previous owner, or a bill of sale for a private purchase. The core form is the Application for Title or Registration (REG 343), which captures identifying information, owner details, odometer reading, and purchase price.7California Department of Motor Vehicles. Application for Title or Registration If something about the car’s history needs explaining, attach a Statement of Facts (REG 256). Both forms are available on the DMV website.8California Department of Motor Vehicles. Forms
Get the engine type and manufacture year right. If either is entered incorrectly, the DMV may flag the application for inspection or deny the smog exemption outright. Verify the VIN decode against the physical engine before you submit. You can file the package at a field office or mail it to the Sacramento processing center.
Fees depend on vehicle type, purchase price, and county, among other factors.9California DMV. Registration Fees The DMV’s online calculator gives a specific estimate for your situation. Initial registrations for cars re-entering the system after being junked or arriving from out of state can take longer, because the DMV verifies the vehicle’s identity and history before issuing plates.
Plate Options for Classic Vehicles
California offers two plate programs aimed at older cars, and they do different things.
Year of Manufacture Plates
Year of Manufacture (YOM) plates let you display period-correct California plates on a matching car. The plates must be genuine, officially manufactured California plates from 1969 or earlier for cars, motorcycles, and trailers, or from 1972 or earlier for commercial vehicles.10California Department of Motor Vehicles. Year of Manufacture (YOM) License Plates The plate year must match the vehicle’s model year. You supply the plates; a DMV field office inspects them for legibility and confirms the number is not in use on another vehicle.
Expect to file a YOM License Plate Application (REG 352) alongside the standard registration forms and to surrender the plates currently assigned to the car. There is an initial fee and an annual fee at renewal. Replicas and specially constructed cars are not eligible.
Historical Vehicle Plates
Historical Vehicle plates under Vehicle Code Section 5004 are available for vehicles manufactured after 1922 that are at least 25 years old and operated primarily for exhibition or car club activities. The initial fee is $25, and the plates are permanent. Vehicles from 1922 or earlier qualify automatically, as do pre-1965 vehicles with engines of 16 or more cylinders.
Importing a Classic From Overseas
Federal law has its own age-based exemption that matters if you are importing a car that was never sold in the United States. Under 49 U.S.C. § 30112, a motor vehicle at least 25 years old is exempt from Federal Motor Vehicle Safety Standards compliance.11Office of the Law Revision Counsel. 49 USC 30112 – Prohibitions on Manufacturing, Selling, and Importing Noncomplying Motor Vehicles and Equipment Younger vehicles that were not built to U.S. standards generally cannot be permanently imported unless NHTSA grants a specific determination of eligibility.12National Highway Traffic Safety Administration. Importation and Certification FAQs
Clearing federal customs does not end the smog question. If the imported car is a 1975 model or earlier, California’s exemption applies. If it falls between 1976 and the 25-year federal threshold, you still have to meet California’s smog requirements for its model year before the DMV will register it. A car can be old enough to legally enter the country yet still too new to escape a California smog check.
Taxes When You Sell at a Profit
The IRS treats long-term capital gains on collectibles differently from gains on stocks or real estate. Under Internal Revenue Code Section 1(h), gains from selling a collectible held for more than one year are taxed at a maximum rate of 28%, compared to the 15% or 20% rate on most other long-term capital assets.13Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed If your ordinary bracket is below 28%, you pay at your regular rate instead. Collectors who have watched a car appreciate for decades usually hit the ceiling.
Higher earners face an additional 3.8% Net Investment Income Tax on top of the collectibles rate when modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly), pushing the effective rate above 31%. Sell a car you have owned for one year or less and the gain is ordinary income at your marginal rate. Keep thorough records of the original purchase price and every receipt for restoration work: those costs raise your tax basis and shrink the taxable gain.
Insuring a Collector Car
Standard auto policies pay the depreciated market value at the time of a loss, which fits daily drivers and badly undervalues a restored classic. Most collector-car insurers write “agreed value” policies instead, where you and the insurer settle on a dollar figure when the policy is issued. If the car is totaled, you receive that agreed amount rather than whatever a claims adjuster calculates after the fact.
Getting that agreed value usually takes documentation: a professional appraisal from a collector-vehicle specialist, receipts for parts and restoration work, current photographs, records establishing matching-number components, and provenance showing ownership history. Update the appraisal after any major restoration work and periodically after that, because values shift with the market. Recent auction results and dealer listings for comparable cars help you support a number when you negotiate with the insurer.